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Coffee Processing (Practical Action Technical Brief)
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== Artificial driers == In the wet season solar drying of produce is difficult and alternative driers are necessary. === Hulling === The dried cherry is then hulled to remove the pericarp. This can be done by hand using a pestle and mortar or in a mechanical huller. The mechanical hullers usually consist of a steel screw, the pitch of which increases (and therefore the pressure) as it approaches the outlet so removing the pericarp. === Cleaning === The hulled coffee is cleaned by winnowing. [[File:coffee processing solardrier.jpg|thumb|150px|right|Figure 2: The exell solar drier]] === Wet processing === In this method the cherry is squeezed in a pulping machine or pestle and mortar which removes the outer fleshy material (mesocarp and exocarp) leaving a bean covered in mucilage. This mucilage is fermented and dispersed. The bean is then washed and dried. === Pulping === This involves the removal of the outer red skin (exocarp) and the white fleshy pulp (mesocarp) and the separation of the beans from the pulp. Immature cherries are hard and green and very difficult to pulp. If the coffee is to be wet-processed, correct harvesting is essential. The two most common pulpers most suitable for small-scale units are the drum and the disc pulpers.
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